<template>
  <view class="uni-load-more" @click="onClick">
    <!-- #ifdef APP-NVUE -->
    <loading-indicator v-if="!webviewHide && status === 'loading' && showIcon"
                       :style="{color: color,width:iconSize+'px',height:iconSize+'px'}" :animating="true"
                       class="uni-load-more__img uni-load-more__img--nvue"></loading-indicator>
    <!-- #endif -->
    <!-- #ifdef H5 -->
    <svg width="24" height="24" viewBox="25 25 50 50"
         v-if="!webviewHide && (iconType==='circle' || iconType==='auto' && platform === 'android') && status === 'loading' && showIcon"
         :style="{width:iconSize+'px',height:iconSize+'px'}"
         class="uni-load-more__img uni-load-more__img--android-H5">
      <circle cx="50" cy="50" r="20" fill="none" :style="{color:color}" :stroke-width="3"></circle>
    </svg>
    <!-- #endif -->
    <!-- #ifndef APP-NVUE || H5 -->
    <view
        v-if="!webviewHide && (iconType==='circle' || iconType==='auto' && platform === 'android') && status === 'loading' && showIcon"
        :style="{width:iconSize+'px',height:iconSize+'px'}"
        class="uni-load-more__img uni-load-more__img--android-MP">
      <view :style="{borderTopColor:color,borderTopWidth:iconSize/12}"></view>
      <view :style="{borderTopColor:color,borderTopWidth:iconSize/12}"></view>
      <view :style="{borderTopColor:color,borderTopWidth:iconSize/12}"></view>
    </view>
    <!-- #endif -->
    <!-- #ifndef APP-NVUE -->
    <view v-else-if="!webviewHide && status === 'loading' && showIcon"
          :style="{width:iconSize+'px',height:iconSize+'px'}" class="uni-load-more__img uni-load-more__img--ios-H5">
      <image :src="imgBase64" mode="widthFix"></image>
    </view>
    <!-- #endif -->
    <text class="uni-load-more__text"
          :style="{color: color}">
      {{ status === 'more' ? contentdownText : status === 'loading' ? contentrefreshText : contentnomoreText }}
    </text>
  </view>
</template>

<script>
let platform
setTimeout(() => {
  platform = uni.getSystemInfoSync().platform
}, 16)

import {
  initVueI18n
} from '@dcloudio/uni-i18n'
import messages from './i18n/index.js'

const {
  t
} = initVueI18n(messages)

/**
 * LoadMore 加载更多
 * @description 用于列表中，做滚动加载使用，展示 loading 的各种状态
 * @tutorial https://ext.dcloud.net.cn/plugin?id=29
 * @property {String} status = [more|loading|noMore] loading 的状态
 *  @value more loading前
 *  @value loading loading中
 *  @value noMore 没有更多了
 * @property {Number} iconSize 指定图标大小
 * @property {Boolean} iconSize = [true|false] 是否显示 loading 图标
 * @property {String} iconType = [snow|circle|auto] 指定图标样式
 *  @value snow ios雪花加载样式
 *  @value circle 安卓唤醒加载样式
 *  @value auto 根据平台自动选择加载样式
 * @property {String} color 图标和文字颜色
 * @property {Object} contentText 各状态文字说明，值为：{contentdown: "上拉显示更多",contentrefresh: "正在加载...",contentnomore: "没有更多数据了"}
 * @event {Function} clickLoadMore 点击加载更多时触发
 */
export default {
  name: 'UniLoadMore',
  emits: ['clickLoadMore'],
  props: {
    status: {
      // 上拉的状态：more-loading前；loading-loading中；noMore-没有更多了
      type: String,
      default: 'more'
    },
    showIcon: {
      type: Boolean,
      default: true
    },
    iconType: {
      type: String,
      default: 'auto'
    },
    iconSize: {
      type: Number,
      default: 24
    },
    color: {
      type: String,
      default: '#777777'
    },
    contentText: {
      type: Object,
      default() {
        return {
          contentdown: '',
          contentrefresh: '',
          contentnomore: ''
        }
      }
    }
  },
  data() {
    return {
      webviewHide: false,
      platform: platform,
      imgBase64: ''
    }
  },
  // #ifndef APP-NVUE
  computed: {
    iconSnowWidth() {
      return (Math.floor(this.iconSize / 24) || 1) * 2
    },
    contentdownText() {
      return this.contentText.contentdown || t("uni-load-more.contentdown")
    },
    contentrefreshText() {
      return this.contentText.contentrefresh || t("uni-load-more.contentrefresh")
    },
    contentnomoreText() {
      return this.contentText.contentnomore || t("uni-load-more.contentnomore")
    }
  },
  // #endif
  mounted() {
    // #ifdef APP-PLUS
    var pages = getCurrentPages();
    var page = pages[pages.length - 1];
    var currentWebview = page.$getAppWebview();
    currentWebview.addEventListener('hide', () => {
      this.webviewHide = true
    })
    currentWebview.addEventListener('show', () => {
      this.webviewHide = false
    })
    // #endif
  },
  methods: {
    onClick() {
      this.$emit('clickLoadMore', {
        detail: {
          status: this.status,
        }
      })
    }
  }
}
</script>

<style lang="scss" scoped>
.uni-load-more {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
  height: 40px;
  align-items: center;
  justify-content: center;
}

.uni-load-more__text {
  font-size: 14px;
}

.uni-load-more__img {
  width: 24px;
  height: 24px;
  margin-right: 8px;
}

.uni-load-more__img--nvue {
  color: #666666;
}

.uni-load-more__img--android,
.uni-load-more__img--ios {
  width: 24px;
  height: 24px;
  transform: rotate(0deg);
}

/* #ifndef APP-NVUE */
.uni-load-more__img--android {
  animation: loading-ios 1s 0s linear infinite;
}

@keyframes loading-android {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

.uni-load-more__img--ios-H5 {
  position: relative;
  animation: loading-ios-H5 1s 0s step-end infinite;
}

.uni-load-more__img--ios-H5 > image {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
}

@keyframes loading-ios-H5 {
  0% {
    transform: rotate(0deg);
  }

  8% {
    transform: rotate(30deg);
  }

  16% {
    transform: rotate(60deg);
  }

  24% {
    transform: rotate(90deg);
  }

  32% {
    transform: rotate(120deg);
  }

  40% {
    transform: rotate(150deg);
  }

  48% {
    transform: rotate(180deg);
  }

  56% {
    transform: rotate(210deg);
  }

  64% {
    transform: rotate(240deg);
  }

  73% {
    transform: rotate(270deg);
  }

  82% {
    transform: rotate(300deg);
  }

  91% {
    transform: rotate(330deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

/* #endif */

/* #ifdef H5 */
.uni-load-more__img--android-H5 {
  animation: loading-android-H5-rotate 2s linear infinite;
  transform-origin: center center;
}

.uni-load-more__img--android-H5 > circle {
  display: inline-block;
  animation: loading-android-H5-dash 1.5s ease-in-out infinite;
  stroke: currentColor;
  stroke-linecap: round;
}

@keyframes loading-android-H5-rotate {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

@keyframes loading-android-H5-dash {
  0% {
    stroke-dasharray: 1, 200;
    stroke-dashoffset: 0;
  }

  50% {
    stroke-dasharray: 90, 150;
    stroke-dashoffset: -40;
  }

  100% {
    stroke-dasharray: 90, 150;
    stroke-dashoffset: -120;
  }
}

/* #endif */

/* #ifndef APP-NVUE || H5 */
.uni-load-more__img--android-MP {
  position: relative;
  width: 24px;
  height: 24px;
  transform: rotate(0deg);
  animation: loading-ios 1s 0s ease infinite;
}

.uni-load-more__img--android-MP > view {
  position: absolute;
  box-sizing: border-box;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: solid 2px transparent;
  border-top: solid 2px #777777;
  transform-origin: center;
}

.uni-load-more__img--android-MP > view:nth-child(1) {
  animation: loading-android-MP-1 1s 0s linear infinite;
}

.uni-load-more__img--android-MP > view:nth-child(2) {
  animation: loading-android-MP-2 1s 0s linear infinite;
}

.uni-load-more__img--android-MP > view:nth-child(3) {
  animation: loading-android-MP-3 1s 0s linear infinite;
}

@keyframes loading-android {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

@keyframes loading-android-MP-1 {
  0% {
    transform: rotate(0deg);
  }

  50% {
    transform: rotate(90deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

@keyframes loading-android-MP-2 {
  0% {
    transform: rotate(0deg);
  }

  50% {
    transform: rotate(180deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

@keyframes loading-android-MP-3 {
  0% {
    transform: rotate(0deg);
  }

  50% {
    transform: rotate(270deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

/* #endif */
</style>
